diff --git a/dlls/wintab32/context.c b/dlls/wintab32/context.c
index ff9a4ca677a..2da04621934 100644
--- a/dlls/wintab32/context.c
+++ b/dlls/wintab32/context.c
@@ -223,7 +223,10 @@ LPOPENCONTEXT AddPacketToContextQueue(LPWTPACKET packet, HWND hwnd)
             if (ptr->context.lcOutExtY > 0)
                 packet->pkY = ptr->context.lcOutExtY - packet->pkY;
             else if (ptr->context.lcOutExtY < 0)
-                packet->pkY = abs(ptr->context.lcOutExtY + packet->pkY);
+            {
+                int y = ptr->context.lcOutExtY + packet->pkY;
+                packet->pkY = abs(y);
+            }
 
             DUMPPACKET(*packet);